Correlation scatter-plot matrix for ordered-categorical data

April 7, 2010 | Tal Galili

When analyzing a questionnaire, one often wants to view the correlation between two or more Likert questionnaire item’s (for example: two ordered categorical vectors ranging from 1 to 5). When dealing with several such Likert variable’s, a clear presentation of all the pairwise relation’s between our variable can be ... [Read more...]

Non-parametric Methods

September 24, 2009 | rtutor.chiyau

A statistical method is called non-parametric if it makes no assumption on the population distribution or sample size. This is in contrast with most parametric methods in elementary statistics that assume the data is quantitative, the population... [Read more...]

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